Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare openWorldHint, idempotentHint and destructiveHint=false, but the description adds genuinely new behavior: the signed-in-account requirement, that a guest call returns 401 and kicks off the OAuth flow, and that the answer is either "verified" or a description of what was missing. That is meaningful context beyond the structured fields.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences, purpose front-loaded, with the auth caveat trailing. The parenthetical method explanations are dense but every clause carries information; nothing is padding.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 3-parameter tool with no output schema, the description covers the methods, the auth prerequisite, and the shape of the response ("verified, or what was missing"), which is what an agent needs to call it correctly. Only minor gaps remain (e.g., what a successful verification does to the claim's state).

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 67%, and the description meaningfully disambiguates the enum by explaining each method's mechanism (badge link on a page, homepage meta tag, TXT record) and the role of pageUrl. This adds real semantic value beyond the bare enum values.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description names a specific verb+resource ("Check the proof placed for a claim") and enumerates the three verification methods, so an agent knows exactly what the tool does. It does not, however, name or contrast itself with the nearby siblings (atlas_owner_claim, atlas_owner_card), so it stops short of full sibling differentiation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

It clarifies the method choices (badge/meta/dns) and the auth prerequisite, which implies when a call is valid, but it never states when to reach for this tool versus atlas_owner_claim or atlas_owner_card. Usage is inferable rather than explicit.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.